Free trials are available as long as a space is free… no point in trying out something if there isn’t room to join in. I want parents too be sure they like the class before committing for a term.
If a space comes up at the start of term, parents send a post-dated cheque for the first class of term to reserve the space . Then they come along on the first week for a free trial. As long as they enjoy it, then they join up. If there is any problem, I just tear up the cheque.